Wireless Power Transmission Coil Position Control
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Solution Overview
Problem
In wireless power transmission to industrial machines with metal components, the changing relative position between power-transmitting and power-receiving coils leads to increased induced current and overheating, reducing efficiency and causing malfunctions.
Innovation Solution
A control unit adjusts electric power based on measured relative positions to minimize induced current through metal members, using a duty table to determine the optimal power transmission ratio and reduce electromagnetic field absorption by metal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electric power is transmitted to a movable portion while it is moving, then the power supply target device can operate during movement, but the relative position between power-transmitting coil and power-receiving coil changes, causing increased induced current in metal members and overheating
Solution Approach 1:
The patent applies dynamics by making the power transmission system adaptive to changing positions. The control unit dynamically adjusts the power transmission amount based on real-time relative position measurements between the power-transmitting coil and power-receiving coil. This dynamic adjustment ensures continuous power supply during movement while preventing excessive induced current and overheating of metal members by reducing power transmission when coils are in positions that would cause harmful electromagnetic effects.
Solution Approach 2:
The patent implements feedback control by measuring the relative position between coils and using this information to adjust power transmission. The measurement unit continuously monitors the relative position, and the control unit uses this feedback to modulate the power transmission amount. This closed-loop feedback system enables the device to maintain safe operating temperatures while ensuring continuous power supply during movement.
2Adaptability or versatility
If the relative position between power-transmitting coil and power-receiving coil changes during movement, then the system remains flexible and movable, but the electromagnetic field distribution changes, increasing induced current through metal members
Solution Approach 1:
The system maintains movement flexibility while dynamically adjusting power transmission based on relative position. The control unit modifies the power transmission amount in response to position changes, optimizing energy efficiency at each position while preserving the ability of the power supply target device to move freely and perform its functions.
3Loss of energy
If power transmission is increased to maintain efficiency when coils are far apart, then power transmission efficiency improves, but induced current in metal members increases causing overheating
Solution Approach 1:
The control unit uses real-time position feedback to dynamically balance power transmission efficiency and safety. When the measurement unit detects that increasing power transmission would cause harmful induced current in metal members, the control unit adjusts the power transmission amount to safe levels, preventing overheating while maintaining optimal efficiency within safe operating parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses overheating and maintains power transmission efficiency by adjusting power transmission dynamically in response to changing coil positions, preventing device malfunctions and energy waste.
Implementation Method 1
a measurement unit that measures a relative position between the power-transmitting coil and the power-receiving coil
Implementation Method 2
a power-transmitting coil that supplies electric power wirelessly to a power-receiving coil
Implementation Method 3
the distribution of the electromagnetic field which transmits electric power from the power-transmitting coil to the power-receiving coil
Implementation Method 4
When the electromagnetic field approaches the metal member and the intensity of the electromagnetic field around the metal member rises, induced current may flow through the metal member
Implementation Method 5
the metal member may be overheated, thereby causing the malfunction and failure
Data Source
Figure 1
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Figure 3(A)~4
AI summary
The wireless power transmission device (1) is a wireless power transmission device which wirelessly transmits electric power between a power-transmitting coil (L1) and a power-receiving coil (L2), and which includes: a metal member (M); a power supply unit (13) which supplies the electric power to the power-transmitting coil; a measurement unit (14) which measures a relative position of the power-receiving coil with respect to the power-transmitting coil; and a control unit (15) which controls the power supply unit. The control unit adjusts the electric power based on the relative position measured by the measurement unit, so that an amount of induced current flowing through the metal member is decreased. According to the present invention, it is possible to provide a wireless power transmission device and a wireless power transmission method which can reduce the amount of induced current flowing through a metal member even when the relative positional relationship between a power-transmitting coil and a power-receiving coil is changed, and which can suppress overheating of the metal member.